Bicyclic bridged metallocene compounds and polymers produced therefrom

Patent metadata

Field	Value
Publication number	US-10118975-B2
Application number	US-201715673456-A
Country	US
Kind code	B2
Filing date	Aug 10, 2017
Priority date	May 25, 2016
Publication date	Nov 6, 2018
Grant date	Nov 6, 2018

Abstract

Disclosed herein are catalyst compositions containing bicyclic bridged metallocene compounds. These catalyst compositions can be used for the polymerization of olefins. For example, ethylene polymers produced using these catalyst compositions can be characterized by low molecular weights and high melt flow rates, and can be produced without the addition of hydrogen.

First claim

We claim:

1. A metallocene compound having the formula:

wherein:
M is Ti, Zr, or Hf;
each X independently is a monoanionic ligand;
E is a hydrocarbon bicyclic bridging group with a single carbon atom connected to Cp 1 and Cp 2 ; and
Cp 1 and Cp 2 independently are a substituted or unsubstituted cyclopentadienyl, indenyl, or fluorenyl group.

2. The compound of claim 1 , wherein:
E is a C 7 to C 12 hydrocarbon bicyclic bridging group; and
at least one of Cp 1 and Cp 2 has a C 1 to C 18 hydrocarbyl substituent.

3. The compound of claim 2 , wherein each X is Cl.

4. The compound of claim 1 , wherein:
at least one of Cp 1 and Cp 2 is unsubstituted; and
E is a C 7 to C 10 saturated hydrocarbon or aromatic hydrocarbon bicyclic bridging group.

5. The compound of claim 4 , wherein each X is Cl.

6. The compound of claim 1 , wherein at least one of Cp 1 and Cp 2 has a substituent selected from H, a halide, a C 1 to C 36 hydrocarbyl group, a C 1 to C 36 halogenated hydrocarbyl group, a C 1 to C 36 hydrocarboxy group, or a C 1 to C 36 hydrocarbylsilyl group.

7. The compound of claim 1 , wherein at least one of Cp 1 and Cp 2 has a substituent selected from a C 1 to C 8 alkyl group or a C 3 to C 8 terminal alkenyl group.

8. The compound of claim 1 , wherein:
Cp 1 is a substituted or unsubstituted indenyl or fluorenyl group; and
Cp 2 is a substituted or unsubstituted cyclopentadienyl group.

9. The compound of claim 8 , wherein E is a C 7 to C 12 hydrocarbon bicyclic bridging group.

10. The compound of claim 9 , wherein:
M is Zr; and
each X is Cl.

11. The compound of claim 8 , wherein:
at least one of Cp 1 and Cp 2 is unsubstituted; and
E is a C 7 to C 10 saturated hydrocarbon or aromatic hydrocarbon bicyclic bridging group.

Assignees

• Chevron Phillips Chemical Co Lp

Inventors

• Praetorius Jeremy M
• Yang Qing
• Boxell Connor D
• Crain Tony R

Classifications

• C08F4/65927 Primary

  two cyclopentadienyl rings being mutually bridged · CPC title

• C08F4/65908

  in combination with an ionising compound other than alumoxane, e.g. (C6F5)4B-X+ · CPC title

• C07F17/00 Primary

  Metallocenes · CPC title

• C08F10/00

  Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond · CPC title

• C08F210/16

  Copolymers of ethene with alpha-alkenes, e.g. EP rubbers · CPC title